A large displacement dual-channel muffler

Abstract

The utility model discloses a large-displacement dual-channel muffler, comprising a cylinder assembly provided with an outer cylinder, a muffler assembly consisting of an intake pipe, an expansion tube assembly, a porous tube group and an exhaust pipe group provided in the chamber of the outer cylinder; the exhaust pipe group includes a first exhaust pipe and a second exhaust pipe; the expansion tube assembly includes an inner expansion tube and an outer expansion tube, the two ends of the inner expansion tube are connected with the intake pipe and the first exhaust pipe, a first muffler layer is formed between the inner expansion tube and the outer expansion tube, a first muffler chamber is formed between the outer expansion tube and the first outer cylinder, a second muffler chamber not connected with the first muffler chamber is provided in the chamber of the outer cylinder; one end of the porous tube group is connected with the second exhaust pipe through the second muffler chamber, and the other end is connected with the first muffler chamber. The utility model adopts a dual exhaust channel structure design respectively connected with the expansion tube assembly and the porous tube group, so as to achieve low exhaust resistance, high efficiency and low noise, and improve the power conversion efficiency of the engine.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycle mufflers, in particular to a large-displacement dual-channel muffler. Background Art

[0002] The existing large-displacement motorcycle muffler has the following problems:

[0003] 1. In order to increase the volume of silencers and reduce noise, a multi-stage silencer structure is set inside the cylinder, which increases the exhaust resistance and seriously affects the output power and torque of the motorcycle engine;

[0004] 2. In order to improve the exhaust efficiency, the silencer module in the cylinder was reduced, resulting in high exhaust noise;

[0005] 3. The single exhaust channel structure design results in large exhaust air resistance and power loss when the motorcycle engine speed is high.

[0006] Therefore, in order to solve the above problems, it is necessary to develop a large-displacement dual-channel muffler to achieve low exhaust resistance, high efficiency and low noise while improving the power conversion efficiency of the engine. Utility Model Content

[0007] In order to solve the above problems, the technical solutions adopted by the utility model are as follows:

[0008] A large-displacement dual-channel muffler, comprising a cylinder assembly, characterized in that the cylinder assembly comprises an outer cylinder with an air inlet and an exhaust port, a muffler assembly is arranged in a chamber of the outer cylinder, and the muffler assembly comprises an air inlet pipe, an expansion pipe assembly, a porous pipe group and an exhaust pipe group arranged in sequence;

[0009] The exhaust pipe group includes a first exhaust pipe and a second exhaust pipe which are coaxially arranged at the exhaust port;

[0010] The expansion tube assembly comprises an inner expansion tube and an outer expansion tube wrapped in the inner expansion tube, the two ends of the inner expansion tube are respectively connected to the air intake pipe and the first exhaust pipe, the other end of the air intake pipe is connected to the air inlet, a first silencing layer connected to the inner expansion tube is formed between the inner expansion tube and the outer expansion tube, a first silencing chamber connected to the first silencing layer is formed between the outer expansion tube and the first outer cylinder, and a second silencing chamber not connected to the first silencing chamber is arranged in the chamber of the outer cylinder;

[0011] The porous tube group includes porous tubes relatively arranged with the axis of the outer cylinder as the center, one end of the porous tube is connected with the second exhaust pipe through the second muffler chamber, and the other end is connected with the first muffler chamber.

[0012] Preferably, a first through hole is provided on at least the expansion section of the inner expansion tube, and a second through hole is provided on at least the expansion section of the outer expansion tube, the first through hole connects the inner cavity of the inner expansion tube with the first sound-absorbing layer, and the second through hole connects the first sound-absorbing layer with the first sound-absorbing chamber.

[0013] Preferably, the first through holes are axially distributed around the axis of the inner expansion tube, the second through holes are axially distributed around the axis of the outer expansion tube, and the first through holes are staggered with the second through holes.

[0014] Preferably, the outer cylinder is provided with a third silencer chamber between the first silencer chamber and the second silencer chamber, and the porous tube is arranged in the third silencer chamber, with both ends thereof being connected with the first silencer chamber and the second silencer chamber respectively.

[0015] Preferably, the first exhaust pipe is provided with a plurality of first silencer holes at a position located in the second silencer chamber.

[0016] Preferably, an inner cylinder is further provided in the chamber of the outer cylinder, the inner cylinder extends from the first silencing chamber to the third silencing chamber, and a plurality of second silencing holes are provided on the inner cylinder.

[0017] Preferably, a sound-absorbing material is provided between the outer cylinder and the inner cylinder.

[0018] Preferably, a first partition is provided between the first silencing chamber and the third silencing chamber, and a second partition is provided between the second silencing chamber and the third silencing chamber;

[0019] Two ends of the porous tube respectively penetrate the first partition plate and the second partition plate and communicate with the first silencing chamber and the third silencing chamber.

[0020] Preferably, the first partition plate and the second partition plate are foam aluminum plates.

[0021] Preferably, two ends of the outer expansion pipe are connected to two ends of the inner expansion pipe or are respectively connected to the outer side walls of the air intake pipe and the first exhaust pipe.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] Compared with the single exhaust channel and multi-stage silencer structure in the prior art, the utility model adopts a double exhaust channel structure design which is respectively connected to the expansion tube assembly and the porous tube group, thereby achieving low exhaust resistance, high efficiency and low noise, and improving the power conversion efficiency of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0025] Figure 2 This is an exploded schematic diagram of the hidden outer cylinder in the utility model;

[0026] Among them: cylinder assembly 1, air intake pipe 2, expansion tube assembly 3, porous tube group 4, exhaust pipe group 5, inner cylinder 6, first baffle 7, second baffle 8, first muffler layer 10, outer cylinder 11, first muffler chamber 20, second muffler chamber 30, inner expansion tube 31, outer expansion tube 32, third muffler chamber 40, porous tube 41, first exhaust pipe 51, second exhaust pipe 52, second muffler hole 6a, first through hole 31a, second through hole 32a, first muffler hole 51a. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right", "up", "down", "front", "rear" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described:

[0031] like Figure 1 , 2 As shown, a large-displacement dual-channel muffler includes a cylinder assembly 1, the cylinder assembly 1 includes an outer cylinder 11 with an air inlet and an exhaust port, a muffler assembly is arranged in the chamber of the outer cylinder 11, and the muffler assembly includes an air inlet pipe 2, an expansion pipe assembly 3, a porous pipe group 4 and an exhaust pipe group 5 arranged in sequence;

[0032] The exhaust pipe group 5 includes a first exhaust pipe 51 and a second exhaust pipe 52 which are coaxially arranged at the exhaust port;

[0033] The expansion tube assembly 3 includes an inner expansion tube 31 and an outer expansion tube 32 wrapped in the inner expansion tube 31, the two ends of the inner expansion tube 31 are respectively connected to the intake pipe 2 and the first exhaust pipe 51, the other end of the intake pipe 2 is connected to the air inlet, a first silencing layer 10 connected to the inner expansion tube 31 is formed between the inner expansion tube 31 and the outer expansion tube 32, a first silencing chamber 20 connected to the first silencing layer 10 is formed between the outer expansion tube 32 and the first outer cylinder 11, and a second silencing chamber 30 not connected to the first silencing chamber 20 is provided in the chamber of the outer cylinder 11;

[0034] The porous tube group 4 includes a porous tube 41 relatively arranged around the axis of the outer cylinder 11 , one end of the porous tube 41 is connected to the second exhaust pipe 52 through the second silencing chamber 30 , and the other end is connected to the first silencing chamber 20 .

[0035] In this embodiment, due to the sudden increase in the cross-sectional area of ​​the expansion tube assembly 3, the sound waves in the exhaust gas undergo two expansions and reflections inside and outside to reduce noise; the first effect chamber and the second silencer chamber 30 are connected through the porous tube 41, and the change in the cross-sectional area of ​​the porous tube 41 is used to change the acoustic impedance, increase the sound transmission loss, eliminate the noise passing frequency, broaden the silencer frequency, and improve the silencer performance.

[0036] In this embodiment, compared with the multi-stage silencer structure of the prior art, a dual exhaust channel structure design which is respectively connected to the expansion tube assembly 3 and the porous tube group 4 is adopted, so that after the exhaust gas undergoes expansion in the inner expansion tube 31, it forms two parts and is discharged from the first exhaust channel and the second exhaust channel respectively; for the exhaust gas entering the first exhaust channel: the exhaust gas successively enters the first silencer layer 10 and the first silencer chamber 20 to undergo step-by-step expansion to lose sound energy, and then enters the second silencer chamber 30 through the porous tube group 4 for silencer treatment and is discharged from the second exhaust pipe 52; for the exhaust gas entering the second exhaust channel, since the exhaust gas loses expansion in the inner expansion tube 31 and part of the sound energy is intercepted, it is directly discharged after being processed through the first exhaust pipe 51. The above structure reduces exhaust resistance, improves exhaust efficiency, improves the power conversion efficiency of the engine, and improves silencer performance and effect.

[0037] Further, such as Figure 1 , 2As shown, in order to make the exhaust gas quickly and effectively divert, it enters the first sound-absorbing layer 10 and the first sound-absorbing chamber 20 in sequence from the inner cavity of the inner expansion tube 31, a first through hole 31a is opened on at least the expansion section of the inner expansion tube 31, and a second through hole 32a is opened on at least the expansion section of the outer expansion tube 32. The first through hole 31a connects the inner cavity of the inner expansion tube 31 with the first sound-absorbing layer 10, and the second through hole 32a connects the first sound-absorbing layer 10 with the first sound-absorbing chamber 20.

[0038] Further, such as Figure 1 , 2 As shown, in order to increase the amount of exhaust gas entering the first silencing layer 10 and the first silencing chamber 20 and intercept more sound waves and airflow entering; the first through holes 31a are axially distributed with the axis of the inner expansion tube 31 as the center circle, and the second through holes 32a are axially distributed with the axis of the outer expansion tube 32 as the center circle;

[0039] In addition, in order to improve the loss effect of sound energy entering the first silencing chamber 20 from the first silencing layer 10, the first through holes 31a and the second through holes 32a are arranged in a staggered distribution.

[0040] Further, such as Figure 1 As shown, the outer cylinder 11 is located between the first silencing chamber 20 and the second silencing chamber 30 and is provided with a third silencing chamber 40. The porous tube 41 is arranged in the third silencing chamber 40, and its two ends are respectively connected to the first silencing chamber 20 and the second silencing chamber 30.

[0041] In this embodiment, the third silencing chamber 40 is provided to form a multi-silencing chamber and a porous tube combination structure, and the acoustic impedance is changed by changing the chamber cross-sectional area, thereby effectively improving the sound transmission loss and thus improving the sound reduction amount.

[0042] Further, such as Figure 1 , 2 As shown, in order to improve the low-frequency silencing effect of the exhaust passage, the first exhaust pipe 51 is provided with a plurality of first silencing holes 51 a at the position of the second silencing chamber 30 .

[0043] Further, such as Figure 1 , 2 As shown, in order to increase the sound energy loss of the exhaust gas entering the first silencer chamber 20 and the third silencer chamber 40 and improve the sound reduction amount, an inner cylinder 6 is also provided in the chamber of the outer cylinder 11, and the inner cylinder 6 extends from the first silencer chamber 20 to the third silencer chamber 40, and a plurality of second silencer holes 6a are provided on the inner cylinder 6.

[0044] Furthermore, in order to increase the loss of exhaust gas sound energy and improve the sound-absorbing effect, a sound-absorbing material (not shown in the figure) is provided between the outer cylinder 11 and the inner cylinder 6, and the sound-absorbing material is glass fiber.

[0045] Further, such as Figure 1 , 2 As shown, in order to form a plurality of mutually independent silencing chambers in the outer cylinder 11 to improve the silencing effect; a first baffle 7 is provided between the first silencing chamber 20 and the third silencing chamber 40, and a second baffle 8 is provided between the second silencing chamber 30 and the third silencing chamber 40;

[0046] Two ends of the porous tube 41 pass through the first partition plate 7 and the second partition plate 8 respectively and communicate with the first silencing chamber 20 and the third silencing chamber 40 .

[0047] Furthermore, the first partition plate 7 and the second partition plate 8 are foam aluminum plates.

[0048] In this embodiment, compared with the partition made of steel plate in the prior art, the foam aluminum plate is used to make the muffler lightweight. At the same time, foam aluminum is a good sound-absorbing material and plays a role in attenuating noise.

[0049] Further, such as Figure 1 As shown, in order to improve the connection stability between the outer expansion tube 32 and the inner expansion tube 31, the two ends of the outer expansion tube 32 are connected to the two ends of the inner expansion tube 31 or are respectively connected to the outer side walls of the intake pipe 2 and the first exhaust pipe 51.

[0050] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the scope of protection of the claims of the utility model patent.

Claims

1. A large displacement dual-channel muffler, comprising a barrel assembly, characterized in that: The cylinder assembly comprises an outer cylinder with an air inlet and an air outlet, a silencer assembly is arranged in the chamber of the outer cylinder, and the silencer assembly comprises an air inlet pipe, an expansion pipe assembly, a porous pipe assembly and an exhaust pipe assembly arranged in sequence; The exhaust pipe group includes a first exhaust pipe and a second exhaust pipe which are coaxially arranged at the exhaust port; The expansion tube assembly comprises an inner expansion tube and an outer expansion tube wrapped in the inner expansion tube, the two ends of the inner expansion tube are respectively connected to the air intake pipe and the first exhaust pipe, the other end of the air intake pipe is connected to the air inlet, a first silencing layer connected to the inner expansion tube is formed between the inner expansion tube and the outer expansion tube, a first silencing chamber connected to the first silencing layer is formed between the outer expansion tube and the first outer cylinder, and a second silencing chamber not connected to the first silencing chamber is arranged in the chamber of the outer cylinder; The porous tube group includes porous tubes relatively arranged with the axis of the outer cylinder as the center, one end of the porous tube is connected with the second exhaust pipe through the second muffler chamber, and the other end is connected with the first muffler chamber.

2. A large displacement dual-channel muffler according to claim 1, characterized in that: A first through hole is provided on at least the expansion section of the inner expansion tube, and a second through hole is provided on at least the expansion section of the outer expansion tube. The first through hole connects the inner cavity of the inner expansion tube with the first sound-absorbing layer, and the second through hole connects the first sound-absorbing layer with the first sound-absorbing chamber.

3. A large displacement dual-channel muffler according to claim 2, characterized in that: The first through holes are axially distributed around the axis of the inner expansion tube, and the second through holes are axially distributed around the axis of the outer expansion tube. The first through holes and the second through holes are staggered.

4. A large displacement dual-channel muffler according to claim 1, characterized in that: The outer cylinder is provided with a third silencing chamber between the first silencing chamber and the second silencing chamber. The porous tube is provided in the third silencing chamber, and both ends of the porous tube are respectively connected with the first silencing chamber and the second silencing chamber.

5. A large displacement dual-channel muffler according to claim 1, characterized in that: The first exhaust pipe is provided with a plurality of first silencer holes at a position located in the second silencer chamber.

6. A large displacement dual-channel muffler according to claim 4, characterized in that: An inner cylinder is also arranged in the chamber of the outer cylinder. The inner cylinder extends from the first silencing chamber to the third silencing chamber. A plurality of second silencing holes are arranged on the inner cylinder.

7. A large displacement dual-channel muffler according to claim 6, characterized in that: A sound-absorbing material is arranged between the outer cylinder and the inner cylinder.

8. A large displacement dual-channel muffler according to claim 4, characterized in that: A first partition is provided between the first silencing chamber and the third silencing chamber, and a second partition is provided between the second silencing chamber and the third silencing chamber; Two ends of the porous tube respectively penetrate the first partition plate and the second partition plate and communicate with the first silencing chamber and the third silencing chamber.

9. A large displacement dual-channel muffler according to claim 8, characterized in that: The first partition plate and the second partition plate are foam aluminum plates.

10. A large displacement dual-channel muffler according to claim 1, characterized in that: The two ends of the outer expansion pipe are connected to the two ends of the inner expansion pipe or are respectively connected to the outer side walls of the air intake pipe and the first exhaust pipe.

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